var Stats = function() {
	var e = Date.now(),
		t = e,
		i = 0,
		n = 1 / 0,
		r = 0,
		s = 0,
		o = 1 / 0,
		a = 0,
		l = 0,
		h = 0,
		c = document.createElement("div");
	c.id = "stats", c.addEventListener("mousedown", function(e) {
		e.preventDefault(), v(++h % 2)
	}, !1), c.style.cssText = "width:80px;opacity:0.9;cursor:pointer";
	var u = document.createElement("div");
	u.id = "fps", u.style.cssText = "padding:0 0 3px 3px;text-align:left;background-color:#002", c.appendChild(u);
	var d = document.createElement("div");
	d.id = "fpsText", d.style.cssText = "color:#0ff;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px", d.innerHTML = "FPS", u.appendChild(d);
	var p = document.createElement("div");
	for(p.id = "fpsGraph", p.style.cssText = "position:relative;width:74px;height:30px;background-color:#0ff", u.appendChild(p); 74 > p.children.length;) {
		var f = document.createElement("span");
		f.style.cssText = "width:1px;height:30px;float:left;background-color:#113", p.appendChild(f)
	}
	var m = document.createElement("div");
	m.id = "ms", m.style.cssText = "padding:0 0 3px 3px;text-align:left;background-color:#020;display:none", c.appendChild(m);
	var g = document.createElement("div");
	g.id = "msText", g.style.cssText = "color:#0f0;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px", g.innerHTML = "MS", m.appendChild(g);
	var y = document.createElement("div");
	for(y.id = "msGraph", y.style.cssText = "position:relative;width:74px;height:30px;background-color:#0f0", m.appendChild(y); 74 > y.children.length;) {
		var f = document.createElement("span");
		f.style.cssText = "width:1px;height:30px;float:left;background-color:#131", y.appendChild(f)
	}
	var v = function(e) {
			switch(h = e) {
				case 0:
					u.style.display = "block", m.style.display = "none";
					break;
				case 1:
					u.style.display = "none", m.style.display = "block"
			}
		},
		b = function(e, t) {
			var i = e.appendChild(e.firstChild);
			i.style.height = t + "px"
		};
	return {
		REVISION: 11,
		domElement: c,
		setMode: v,
		begin: function() {
			e = Date.now()
		},
		end: function() {
			var h = Date.now();
			return i = h - e, n = Math.min(n, i), r = Math.max(r, i), g.textContent = i + " MS (" + n + "-" + r + ")", b(y, Math.min(30, 30 - 30 * (i / 200))), l++, h > t + 1e3 && (s = Math.round(1e3 * l / (h - t)), o = Math.min(o, s), a = Math.max(a, s), d.textContent = s + " FPS (" + o + "-" + a + ")", b(p, Math.min(30, 30 - 30 * (s / 100))), t = h, l = 0), h
		},
		update: function() {
			e = this.end()
		}
	}
};

(function(window) {

				var ctx,hue,logo,form,buffer,target = {},tendrils = [],settings = {};

				settings.debug = false;
				settings.friction = 0.5;
				settings.trails = 20;
				settings.size = 50;
				settings.dampening = 0.25;
				settings.tension = 0.98;

				Math.TWO_PI = Math.PI * 2;

				function Oscillator(options) {
					this.init(options || {});
				}

				Oscillator.prototype = (function() {

					var value = 0;

					return {

						init: function(options) {
							this.phase = options.phase || 0;
							this.offset = options.offset || 0;
							this.frequency = options.frequency || 0.001;
							this.amplitude = options.amplitude || 1;
						},

						update: function() {
							this.phase += this.frequency;
							value = this.offset + Math.sin(this.phase) * this.amplitude;
							return value;
						},

						value: function() {
							return value;
						}
					};

				})();

				function Tendril(options) {
					this.init(options || {});
				}

				Tendril.prototype = (function() {

					function Node() {
						this.x = 0;
						this.y = 0;
						this.vy = 0;
						this.vx = 0;
					}

					return {

						init: function(options) {

							this.spring = options.spring + (Math.random() * 0.1) - 0.05;
							this.friction = settings.friction + (Math.random() * 0.01) - 0.005;
							this.nodes = [];

							for(var i = 0, node; i < settings.size; i++) {

								node = new Node();
								node.x = target.x;
								node.y = target.y;

								this.nodes.push(node);
							}
						},

						update: function() {

							var spring = this.spring,
								node = this.nodes[0];

							node.vx += (target.x - node.x) * spring;
							node.vy += (target.y - node.y) * spring;

							for(var prev, i = 0, n = this.nodes.length; i < n; i++) {

								node = this.nodes[i];

								if(i > 0) {

									prev = this.nodes[i - 1];

									node.vx += (prev.x - node.x) * spring;
									node.vy += (prev.y - node.y) * spring;
									node.vx += prev.vx * settings.dampening;
									node.vy += prev.vy * settings.dampening;
								}

								node.vx *= this.friction;
								node.vy *= this.friction;
								node.x += node.vx;
								node.y += node.vy;

								spring *= settings.tension;
							}
						},

						draw: function() {

							var x = this.nodes[0].x,
								y = this.nodes[0].y,
								a, b;

							ctx.beginPath();
							ctx.moveTo(x, y);

							for(var i = 1, n = this.nodes.length - 2; i < n; i++) {

								a = this.nodes[i];
								b = this.nodes[i + 1];
								x = (a.x + b.x) * 0.5;
								y = (a.y + b.y) * 0.5;

								ctx.quadraticCurveTo(a.x, a.y, x, y);
							}

							a = this.nodes[i];
							b = this.nodes[i + 1];

							ctx.quadraticCurveTo(a.x, a.y, b.x, b.y);
							ctx.stroke();
							ctx.closePath();
						}
					};

				})();

				// ----------------------------------------------------------------------------------------

				function init(event) {

					document.removeEventListener('mousemove', init);
					document.removeEventListener('touchstart', init);

					document.addEventListener('mousemove', mousemove);
					document.addEventListener('touchmove', mousemove);
					document.addEventListener('touchstart', touchstart);

					mousemove(event);
					reset();
					loop();
				}

				function reset() {

					tendrils = [];

					for(var i = 0; i < settings.trails; i++) {

						tendrils.push(new Tendril({
							spring: 0.45 + 0.025 * (i / settings.trails)
						}));
					}
				}

				function loop() {

					if(!ctx.running) return;

					ctx.globalCompositeOperation = 'source-over';
					ctx.fillStyle = 'rgba(8,5,16,0.4)';
					ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
					ctx.globalCompositeOperation = 'lighter';
					ctx.strokeStyle = 'hsla(' + Math.round(hue.update()) + ',90%,50%,0.25)';
					ctx.lineWidth = 1;

					for(var i = 0, tendril; i < settings.trails; i++) {
						tendril = tendrils[i];
						tendril.update();
						tendril.draw();
					}

					ctx.frame++;
					ctx.stats.update();
					requestAnimFrame(loop);
				}

				function resize() {
					ctx.canvas.width = window.innerWidth;
					ctx.canvas.height = window.innerHeight;
				}

				function start() {
					if(!ctx.running) {
						ctx.running = true;
						loop();
					}
				}

				function stop() {
					ctx.running = false;
				}

				function mousemove(event) {
					if(event.touches) {
						target.x = event.touches[0].pageX;
						target.y = event.touches[0].pageY;
					} else {
						target.x = event.clientX
						target.y = event.clientY;
					}
					event.preventDefault();
				}

				function touchstart(event) {
					if(event.touches.length == 1) {
						target.x = event.touches[0].pageX;
						target.y = event.touches[0].pageY;
					}
				}

				function keyup(event) {

					switch(event.keyCode) {
						case 32:
							save();
							break;
						default:
							// console.log(event.keyCode); hovertree.com
					}
				}

				function save() {

					if(!buffer) {

						buffer = document.createElement('canvas');
						buffer.width = screen.availWidth;
						buffer.height = screen.availHeight;
						buffer.ctx = buffer.getContext('2d');

						form = document.createElement('form');
						form.method = 'post';
						form.input = document.createElement('input');
						form.input.type = 'hidden';
						form.input.name = 'data';
						form.appendChild(form.input);

						document.body.appendChild(form);
					}

					buffer.ctx.fillStyle = 'rgba(8,5,16)';
					buffer.ctx.fillRect(0, 0, buffer.width, buffer.height);

					buffer.ctx.drawImage(canvas,
						Math.round(buffer.width / 2 - canvas.width / 2),
						Math.round(buffer.height / 2 - canvas.height / 2)
					);

					buffer.ctx.drawImage(logo,
						Math.round(buffer.width / 2 - logo.width / 4),
						Math.round(buffer.height / 2 - logo.height / 4),
						logo.width / 2,
						logo.height / 2
					);

					window.open(buffer.toDataURL(), 'wallpaper', 'top=0,left=0,width=' + buffer.width + ',height=' + buffer.height);

				}

				window.requestAnimFrame = (function() {
					return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function(fn) {
						window.setTimeout(fn, 1000 / 60)
					};
				})();

				window.onload = function() {

					ctx = document.getElementById('canvas').getContext('2d');
					ctx.stats = new Stats();
					ctx.running = true;
					ctx.frame = 1;

					hue = new Oscillator({
						phase: Math.random() * Math.TWO_PI,
						amplitude: 85,
						frequency: 0.0015,
						offset: 285
					});
					document.addEventListener('mousemove', init);
					document.addEventListener('touchstart', init);
					document.body.addEventListener('orientationchange', resize);
					window.addEventListener('resize', resize);
					window.addEventListener('keyup', keyup);
					window.addEventListener('focus', start);
					window.addEventListener('blur', stop);

					resize();

					if(window.DEBUG) {

						var gui = new dat.GUI();

						// gui.add(settings, 'debug');
						settings.gui.add(settings, 'trails', 1, 30).onChange(reset);
						settings.gui.add(settings, 'size', 25, 75).onFinishChange(reset);
						settings.gui.add(settings, 'friction', 0.45, 0.55).onFinishChange(reset);
						settings.gui.add(settings, 'dampening', 0.01, 0.4).onFinishChange(reset);
						settings.gui.add(settings, 'tension', 0.95, 0.999).onFinishChange(reset);

						document.body.appendChild(ctx.stats.domElement);
					}
				};

			})(window);